[gpm]imps2 repeater

[Andrew Pimlott]

On Wed, Feb 20, 2002 at 12:13:36AM +0100, Nico Schottelius wrote:
> Just send the patch to me. I don't mind where it comes from,
> I mind if it works or not.

Ok, this patch (against 1.20.0-gamma) is based on the Debian patch.
It adds an ms3 repeater (supporting the wheel), and also fixes the
ms3 driver to support the wheel.  A couple issues:

- The Debian patch adds wdx and wdy to Gpm_Event, to support (in
  principle) arbitrary wheel deltas.  1.20.0-gamma supports wheels
  with the GPM_B_UP and GPM_B_DOWN button bits, so I just threw away
  everything except one bit of wdy.  I don't think this is a big
  deal in practice (at least, not for me).

  Code from Debian patch, in case you're interested:

    switch (data[3] & 0x0f) {
      case 0x0e: state->wdx = +1; break;
      case 0x02: state->wdx = -1; break;
      case 0x0f: state->wdy = +1; break;
      case 0x01: state->wdy = -1; break;
    }

- The M_ms3 change is untested, but I'm pretty sure it's right.  I
  may be able to test it later.

Regarding my questions in my first mail, Blaise mailed me privately
saying that he uses the imps2 repeater with X, and has experienced
no problems.  I'm not exactly sure why, so I tend to think the ms3
repeater should be preferred for the reason I described (again,
unless I misunderstand something).

Andrew

--- mice.c.orig	Tue Feb 19 22:02:23 2002
+++ mice.c	Wed Feb 20 00:15:39 2002
@@ -369,14 +369,39 @@ static int M_ms3(Gpm_Event *state,  unsi
 {
    state->buttons= ((data[0] & 0x20) >> 3)   /* left */
       | ((data[3] & 0x10) >> 3)   /* middle */
-      | ((data[0] & 0x10) >> 4);   /* right */
+      | ((data[0] & 0x10) >> 4)   /* right */
+      | (((data[3] & 0x0f) == 0x0f) * GPM_B_UP)     /* wheel up */
+      | (((data[3] & 0x0f) == 0x01) * GPM_B_DOWN);  /* wheel down */
    state->dx=      (signed char)(((data[0] & 0x03) << 6) | (data[1] & 0x3F));
    state->dy=      (signed char)(((data[0] & 0x0C) << 4) | (data[2] & 0x3F));
-   /* wheel (dz??) is (data[3] & 0x0f) */
 
    return 0;
 }
 
+static int R_ms3(Gpm_Event *state, int fd)
+{
+   char buf[4] = {0, 0, 0, 0};
+   int dx, dy;
+
+   buf[0] |= 0x40;
+
+   if (state->buttons & GPM_B_LEFT)     buf[0] |= 0x20;
+   if (state->buttons & GPM_B_MIDDLE)   buf[3] |= 0x10;
+   if (state->buttons & GPM_B_RIGHT)    buf[0] |= 0x10;
+   if (state->buttons & GPM_B_UP)       buf[3] |= 0x0f;
+   if (state->buttons & GPM_B_DOWN)     buf[3] |= 0x01;
+
+   dx = limit_delta(state->dx, -128, 127);
+   buf[1] = dx & ~0xC0;
+   buf[0] |= (dx & 0xC0) >> 6;
+ 
+   dy = limit_delta(state->dy, -128, 127);
+   buf[2] = dy & ~0xC0;
+   buf[0] |= (dy & 0xC0) >> 4;
+
+   return write(fd,buf,4);
+}
+
 /* M_brw is a variant of m$ 'Intellimouse' the middle button is different */
 static int M_brw(Gpm_Event *state,  unsigned char *data)
 {
@@ -2065,7 +2090,7 @@ Gpm_Type mice[]={
                                 {0xc0, 0x00, 0x00, 0x00}, 4, 1, 0, 0, 0},
    {"ms3", "Microsoft Intellimouse (serial) - 3 buttons, wheel unused",
            "", M_ms3, I_pnp, CS7 | STD_FLG,
-                                {0xc0, 0x40, 0xc0, 0x00}, 4, 1, 0, 0, 0},
+                                {0xc0, 0x40, 0xc0, 0x00}, 4, 1, 0, 0, R_ms3},
    {"netmouse",  "Genius NetMouse (ps2) - 2 buttons and 2 buttons 'up'/'down'.", 
            "", M_netmouse, I_netmouse, CS7 | STD_FLG,
                                 {0xc0, 0x00, 0x00, 0x00}, 4, 1, 0, 0, 0},